Drilling and countersinking tool



Sept. 19, A. SMITH DRILLING AND QOUNTERSINKING TOOL Filed Dec. 23, 1942i 2 0 M a um J. A. MW W Patented Sept. 19, 1944 DRILLING A.COUNTERSINKING Toot a srm A- Smith, L s s, Ca ass nqr j Robert H.Clark, Los Angeles, Calif.

Application December 23,1942, Serial No. 469,859

4 Claims. (.'Cl. rr-sp This invention relates to boringor drilling toolsand relates more particularly to a combination drilling tool andcountersinking .tool. A general object of this invention isto provide asimple, practical and efiective drilling and countersink.- ing tool.

In the manufacture and construction of numerous structures and machinesit is ne s a y to inset or countersinkithe heads of the screws, bolts,and other fastening parts. In such cases it has been the generalpractice to firstedrill the openings for the reception of the screws orbolts and then form the counter-bores or .ccumttrsinks to receive thescrewheads .Or bolt heads. Separa'tetools are employed for. the drillingand 0011! ters'inking operations and it haszbeen necessary to provideand'maintai-nathe'; required drills and the countersinks and 'to .carryon two entirely separate series tofoperations, .one ior thedrilling orthe openings and the other for :therorming of thecountersi-nkdepressions.

Another object of this'invention-is to provide a single tool operable todrill .an opening orbore and to form a .counterbcre QrcOuntersinkdepres-'sion at the mouth of the bore, the tool performing the boring andcountersinking in ,one continuousbperatiOn;

Another object .of .the invention :is 5110 p vide aicountersink tool.requiringa minimum amount of tool steel .or other'hardputtingmaterial.'

Another-object of this invention is to provide a tool of thecharacter-mentioned in w i t countersinking .means is :mounted on ;thetool body to come into engagement :with the workim-=mediatel-y'rfol1owing .the drilling of the opening 5 for removablymounting ithe;countersink bits in their operativepositions.

Another-object of this invention is to provide -a tool-o'f the characterreferred to in which .both

the drill andthe countersink-bits-may:be removed for 'resharpening: orfor replacementby drills and bits of different shapes, sizes etc.

;Another object of -'this-=inVehti0n is :to provide -a drilling and-counters i nkin g tool of the char- -acter mentioned in whi'chasimple'integral body carrie both the drill and-couhteisinkbits. "Theone iece body of the. tool .may .be in the nature of an adapter .or.so'cket'ior engagement in the spindle of .a drill press,idrillingmachine, 01 other tool or machine suitable for drill ng andcountersinkingoperations'.

Anotherobjectflof this invention is to provide an adjustablecountersinlging tool. The tool of this invention is readily ad ustabletoq m unterbores or countersink dP fiQns ofgdifierent diameters and h Wels r iqh a e. 'e angles. j

A' further object. of this iinvfilltiO .is P i vide .an adjustablecounter-s1 klng-itgol having readily replaceable bits=so tha e toqlgmayquickly reconditioned whenthe ts become dull .and so that the toolmay-he-easi yconverted or d pted: for per t n on materi s of dif e ennatures and for the formation of counterbores and countersink d nessicns q f rent confi urations, sizes, etc. V

The various objects and features of my invention will-:be fullyunderstood from the following detailed description of typical preferredforms and applications .of .my invention, throughout which descriptionefe ence is mad to t e company ng ra i s.1;in:w Qh;

Fig. 1 is a .side elevation of one form of tool provided by ;:thisinvention-with the principal parts appearing in longitudinal .crosssection. Fig. -2 .isan end VieW-pf'the toolillustrated in Fig. 1. Fig.-3-is aiongitudin'ahdetailed sectional view of theadjustable-boring andcountersinking tool of theinvention with a portion-0f the body appearingin side elevation. Fig. .-.4 is af fragmen- 1 tary side elevation of,another formofthe inven- .tion, and Fig. 5 is an .end-view of thestructure illustrated in Fig. 4. 1

The embodiment of the invention illustrated in :Figs. -1 and 2 of :thedrawing may be said -to comprise, generally, a bodyJ 0 for carrying adrill I 'I counter-sinking Lbits 2 ,and means I 3 Jar re :movably Iretaining the bits 4 2 on the.bodv.

' The body l0 maybe-varied ini-shape andnonstruction to ;adapt the toolfor different -l1 s esand to permit the use of the tool in differenttypeset drilling and -co1-intersinking-tools and machines. In [thedrawing thejody .10 is-in the form of an" adapter or socketaintendedetobe inserted .in the spindle of amaehineit being apparentthat the body 10.maye-be of different design. The 'body 4 0 I is preferably; an longate,one-piece member.'- In the case illustrated the body H3 islongitudinally tapered: throughout the greater .part of its length and;is provided at its -,inner .end with .a fiat sided tang 4 1119facilitate the transthat the bits" l2 mission of rotation to the tool.The forward portion I5 of the body I0 is cylindrical and the forward endcorner of the body is bevelled or rounded ofi. A longitudinal opening I6enters the body ID from its forward end to receive the drill I I. Theopening I6 may be shaped and proends of the bits I2 are adapted tocooperate with the upper walls of the grooves 20 to definitely stop orposition the bits. The lower or-active end portions of the bits I2 areshaped to bear inwardly against the drill I I and to have effectivecutting engagement with the work. The inner sides of the protrudingportions of the bits l2 have concave surfaces 22 for bearing inwardlyagainst the drill I I. Thesebearing surfaces 22 may xtend tothe lowerextremities of the bits I2. With th bits I2 correctly seated in theirgrooves 20 to bear inwardly against the drill I I the bits project asubstantial distance from the -lower end of the'body I0 and theirprojecting Means is provided for retaining the drill I I in the bodyopening I6 and for transmitting rotation from the body to the drill.This means may comprise a set screw I8 threaded in a radial opening becontinued after the completion of the drilled opening to advanc the bitsI2 against the work so that the drilled; opening and the countersinkdepression are formed in on continuous operation. Inaccordance with theinvention there is aplurality of'gbits' IZfseparately "mounted on thebodyfIIl. In} the drawing 1 have shown three identical bit's I2-,'-itlbeingunderstood that there aybe two, thr'e,'- or more bits," asdesired.

The body 'III is formed to removably support the bits I2 in their activecutting positions. The

forward end of thebody ID has slots or grooves .2Ilfor the receptionofthe bits I2. The grooves znere preferably identicaland equallycircumfer'entially spacedl' The sidewalls of the grooves '20 are fiatan'd'paral lel andthe grooves preferably have flat inner walls- 2|. [Theinner walls :2I are pitched forwardlyfand inwardly relative to thecentral longitudinal 'axis" of the tool. The

inclination orpit'ch'of'lthe several walls 2| is th'e sam in the;several g'rooves' 2fl. The upper end walls of the grooves 2I' arealbru'pt but may be 'concave 'if desired. The grooves extend to theforwardendof the body IB- where they are open so 'thatthe bits l 2 mayproject beyond the body 'for engagemenfiwith the work. The grooves '20join or mergewith thedrill carrying opening I6 so that the bits I2 maybear inwardly against the drill. The individual 'groovesf20 may lie'inplanes that are, radial with respect to the longitudinal axisofthetoolbr may lie in planes pitched with respectjto 's aid axisi'I-usually'prefer to pitch the grooves 20slightly forwardrelative to thenormal right-hand direction of rotation of th tool so have a moreeffective cutting action. l

Th bits I2 are independent parts removably engaged in their respective.grooves 20. The several cutting parts or bits I2 are preferably alikeor identical. The fbits l2 are in the nature of blocks of suitablecutting material such as tool steel, high speed steel, or th like. Inthe construction illustratedthe bits I2 are square or rectangular intransverse cross section and their responding walls-of the grooves 20.Th ppe inserted in their grooves 20.

.eration' by a single, machine.

portions. are shaped or dressed to have effective cutting engagementwith the work to form a counterbore or countersink of the desired shapeand depth.

The active projecting portions of the cutting parts of the bits I2 maybe given various shapes to out countersink depressions of the selectedconfigurations. In the construction illustrated the projecting-portionsof the bits I2 are dressed or bevelled off at theirppposite sides tohave downwardly convergent surfaces and the outer surfaces are dressedoil to slope downwardly and inwardly toward the drill .I I'.v Thisprovides the bits I2 with effective cutting. edges 23. It will beapparent how the projecting portions of the cutting'parts or bits :I2may be" ground .or dressed other ways to have" the required' form ofcutting edges; v 1 i V Them'eans for removably securing thebits I2 tothe body .IIIischaracterized by its simplicity. The means I 3"comprisesa simple collar or sleeve 24 removably 'screw-threaded on thecylindrical body portion I5. Thefl'ower endof-the sleeve 24 has anannular inturn'ed lip'25. The inner surfaceof 'the lipi25 is adaptedptocooperate with'the outer faces of the bits I2 ;to clamp and pitcheddownwardly land inwardly so that it may flatlycooperatewith the outerfacesof the divergent bits I2 to firmly hold them in their grooves 20. 5I g It is believed that the operation'of the tool illustrated Figs. 1and 2 of the drawing will be readily understood. The drill II is easilyinsertd in the opening I6 and secured to the body II) by the set screwI8. The countersink bits IZ'of the selected size andshape are easilyWith the bits I2 in place the sleeve 24 is threaded on the body I0soathat its lip 25 -comes'into engagement with theblts I2." The sleeve'24 may be tightened to securely retain the bits I2 in their grooves.When the tool is being operated by a suitable drilling machine, eitherstationary, portable or manual, the drill II is advanced against thework and is fed into the work to form the bore. When it isdesired toalso form'a counterbore the'advancement is continued so that the activeends "of the countersink :bits I2-come into eng'agementf with the work.-I The countersink bits I2 readily form or drill. the countersinkdepression at the mouth-of thebored opening. It is :to be observed thatthe drilling and countersinking areperfor'med in a single'continuous op-The-drill -II is dependably supported and is braced by thecountersinking bits I2 which bear inwardly againstit-atcircumferentially spaced points beyond the end of the body III. Thebits I2 provide additi na support for the drill. 3 v

e eas ry emavar a ay In practice? so s {in erb'qres' and counterrentsizes afrid "elitists l|l to clamp against the drill shank when the toolis utilized as a drill holder.

The forward end portion of the body his formed to carry the adjustablecountersink bits l2. A plurality of circumferentially spaced grooves 33is provided in the forward end of the body to carry the bits. There maybe two, .three or more equally circumferentially spaced grooves 33. Thegrooves 33 may resemble the above described grooves and preferably haveflat side walls. The inner walls 34 of the grooves 33 are flat and arepitched downwardly and inwardly with respect to the longitudinal axis ofthe tool. The grooves 33 join or merge with the opening 3|.

The countersinking bits ll! are cuttingparts removably and adjustablyengaged in the grooves 33 to project beyond the lower end of the bodyl|l*= to have active engagement with the work. The bits l2 may besimilar to the above described bits and are shaped to slidably engageinthe grooves 33. In the form of the invention illustrated the bits l2 aresquare or rectangular in transverse cross-section and are of substantiallength. The side surfaces of the bits l2 bear on the side walls of thegrooves 33 and the inner sides of the bits are adapted to ride on thesloping inner walls 34. Concave surfaces 35 are provided on the innersides of the bits l2 adjacent their lower ends. The active lower endportions of the bits l2 are suitably shaped and dressed to have thedesired cutting action and to form the countersink depressions of therequired shape. I have shown the bits |2 'provided with active cuttingedges of substantially the same kind as in the previously describedformof the invention.

Means is provided for retaining the bits I2 on the body ID. This meansincludes a sleeve 36 removably screw-threaded on the forward end of thebody I0 The sleeve 36 extends beyond adjusted positions.

Is 0 a the useofthe i601 illustrated in Fig. l 9H e eet ..si. eand heeen a 'tfieifi'grooves33 and the"'sleeve3fi' is threaded on the body IllThe stem 38 may then be adjusted to set or adjust the bits l2. The head39 may be readily engaged by a screw driver or the like for threadablyadjusting the stem 38. It will be seen that when the stem38 is fedforwardly the bits I2 are spread or adjusted outwardly. 0n the otherhand, when the stem 38v is shifted rearwardly the bits |2 are permittedto retract or move inwardly. The sleeve 36 may be threaded inwardly oroutwardly during the adjustment or operation of the stem 38 to permitthe outward adjustment or expansion of the bits I2 in their The tool ofFig. 3 carries removable countersink bits |2 that may be replaced bybits of different shapes and'the tool embodies the means 30 foradjusting the selected bits to form counterbores or countersinkdepressions of any selected diameter and pitch or inclination.

Figs. 4 and 5 of the drawing illustrate counterbore bits 40 useful inmaking cylindrical counterbores and in facing off flat surfaces aroundthe drilled openings. The bits 40 may be employed either in the form oftool illustrated in Figs. 1 and 2 or in the tool illustrated in Fig. 3.The bits 40 are removably-engaged in the grooves 2| or the grooves 33,as the case may be, and protrude from the lower end-of the tool. Theprojecting portions of the bits 40 are dressed or shaped to have cuttingedges 4| which lie in a plane substantially normal to the longitudinalaxis of the tool. These cutting edges 4| may be radial or may be pitchedwith respect to radial lines of the tool. It is believed that it will beapparent how the bits 40 illustrated in Figs. 4 and 5 of the drawing maybe utilized in the above described tools of the invention to formcylindrical counterbores and to face off flat surfaces around thedrilled openings.

Having described only typical preferred forms and applications of myinvention, I do not wish to be limited or restricted by the specificdetails herein set forth, but wish to reserve to myself any variationsor modifications that may appear to those skilled in the art or fallwithin the scope of the following claims.

Having described my invention, I claim:

1. A tool of the character described including a. body having a shankfor mounting it in a as .3." i rr b i d u 4 ae are machine 1 and havinga bore entering itfrom its jforward endjand adapted "to receive and holda drill and havingspaced grooves ex'tending'longitudinallyin it fromsaid end, the inner walls of the grooves being pitched to; convergetoward .a point. beyond said end' of thebbdy, countersink bits removablyengaged in [said grooves to engage said walls and 'projectfrom saidt endof the body in converging relation','and means for holding the bits inthe. grooves. V

A tool, of the character described 'ing a body having a. bore enteringit 'from its forward end and adapted to' receiveand 'hold a. drillandhaving spa cedi grooves extending longitudinally in it ;from.saideend, there. being shoulders at the inner ends of the grooves, the

inner walls of the groovesfbeing pitched to con- :verge toward a point.beyondis'aid .end 'of the Jbody; countersinki bits .rernovably engagedin (said grooves to engage 'saidwalIsshouHdersand 20 project from saidend of theibo'dy'in converging frelation, and means 'for. holding thebits in the grooves including a sleeve on the body having-a partcooperating with the outer sides of thebits. I f V Q JS LA tool of thecharacter described including a body havinga longitudinal openingandciroumferentially rspaiced groovesv in its forward end portion,countersink bitsarranged insaid .grooves'and adapted to project fromsaid end of 5 the body, and means foradjusting the bits radial- 1yincluding a screw actuated stem in said opening for-engaging theinnersides of the bits, and a-niovablelsleeve threaded onthe body fromits forward end for engaging the outer sides e 4, A tool or "thecharacter described including a body hav ga longitudinal opening andcircumferentiallyspaced longitudinally disposed groovesI in its forward,end portion, countersink 15.bits' arranged in said grooves and adaptedto 'projectnfrom the forward end of the-body. and

means for adjusting the bits radially includ- 25 bitsin the desiredpositions.

a. LAWSON A;

